.A Pitch-variation Moire Fringes Method of Temporal Phase Unwrapping Profilometry[J].Optoelectronics Letters,2007,3(3):215-218 A Pitch-variation Moire Fringes Method of Temporal Phase Unwrapping Profilometry Tian Jin-dong Peng Xiang Zhao Xiao-bo Key laboratory of Optoelectronic Devices and Systems of Education Ministry, Institute of Optoelectronics, ShenzhenUniversity, Shenzhen 518060, China Abstract:       A method of pitch-variation moire fringes is proposed to realize the temporal phase unwrapping for three-dimensional profilometry. On the basis of the principle of moire pattern, we achieve variable spatial frequencies of fringes in a moire pattern by rotating two gratings. Furthermore a five-point fitting method is used to automatically compute the central position of side-lobe spectrum of the moire fringes. Finally, a generalized temporal phase unwrapping algorithm is introduced to process the three-dimensional reconstruction. The theoretical analysis and experimental results show the validity of the proposed method. Hits: 3640 Download times: 203 View Full Text    Download reader